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J/other/RAA/11.309  Nearby early-type galaxies in Stripe 82  (Jiang+, 2011)
Surface photometry and radial color gradients of nearby luminous early-type
galaxies in SDSS Stripe 82.
    Jiang F.-Z., Huang S., Gu Q.-S.
   <Res. Astron. Astrophys., 11, 309-326 (2011)>
   =2011RAA....11..309J
ADC_Keywords: Galaxies, nearby ; Photometry, surface ; Photometry, SDSS

Keywords: galaxies: early-type galaxies -
          galaxies: surface brightness profiles and color gradients -
          techniques: photometric

Abstract:
    We make use of the images from the Sloan Digital Sky Survey Stripe 82
    (Stripe 82) to present an analysis of r band surface brightness
    profiles and radial color gradients (g-r, u-r) in our sample of
    111 nearby early-type galaxies (ETGs). Thanks to the Stripe 82 images,
    each of which is co-added from about 50 single frames, we are able to
    pay special attention to the low-surface-brightness areas (LSB areas)
    of the galaxies.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tablea1.dat      167      143   Detailed information about the sample,
                              photometric results and color gradients


See also:
 J/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)
 J/ApJS/186/233  : Variable point sources in SDSS stripe 82. I. (Bhatti+, 2010)
 J/A+A/525/A37   : QSOs variability indexes in SDSS Stripe 82 (Meusinger+, 2011)


Byte-by-byte Description of file: tablea1.dat

   Bytes Format Units   Label     Explanations

   1- 19  A19   ---     SDSS      SDSS Name (JHHMMSS.s+DDMMSS.S)
      20  A1    ---     n_SDSS    [a] low quality photometry (1)
  22- 33  F12.8 deg     RAdeg     Right ascension in decimal degrees (J2000)
  35- 45  F11.8 deg     DEdeg     Declination in decimal degrees (J2000)
  48- 51  F4.2  ---     FdV       [0/1] Photometric parameter fracDev(r) (2)
  54- 59  F6.4  ---     n         ? Sersic index
  63- 69  F7.4  pix     Re        ? Effective radius
  72- 76  F5.2  pix     R90       ? Radius containing 90% of the Petrosian flux
  79- 85  F7.5  ---     Cr        ? Concentration index in r (R90/R50) (4)
  87- 93  F7.4 mag/arcsec2 mue    ? Surface brightness within Re (4)
  95-105  F11.8 ---     g(g-r)i   ? Inner g-r colour gradient (3)
 108-118  F11.8 ---     g(g-r)o   ? Outer g-r colour gradient (3)
 120-130  F11.8 ---     g(u-r)i   ? Inner u-r colour gradient (3)
 132-141  F10.7 ---     g(u-r)o   ? Outer u-r colour gradient (3)
 142-153  F12.9 ---     a4/a      ? Isophotal parameter a4/a
 155-160  F6.4  ---     e         ? Ellipticity (1-b/a)
 163-167  F5.2  mag     rmag      ? r magnitude

Note (1): a: The photometric results are not reliable, so it is not taken
     into the analyses
Note (2): fracDev(r) indicates how well a galaxy's profile is modeled by
     its de Vaucouleurs profile (Sersic index n=4) in the red band: a 
     value of 1 means a typical de Vaucouleurs profile.
Note (3): the color gradient in the color "col" is defined as
     d(col)/dlog(R/Re)
Note (4): the 2 columns (Cr and mue) are inverted in the paper.



History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    25-Nov-2011